Toshiba MMU-AP0152SH Service Manual page 28

6
ELECTRIC WORK
Cable connection
REQUIREMENT
• As the remote controller cable has no polarity, there is no problem if connections to indoor unit terminal blocks
A and B are reversed.
• Be sure to pass the cable through the bushing of cable connection port of the indoor unit.
• Keep a margin (approx. 100mm) on a cable to hang down the electric parts box at servicing, etc.
• The low-voltage circuit is provided for the remote controller. (Do not connect high-voltage circuit.)
• Remove the cover of the electric parts box.
• Slit film of the bushing attached to the wire inlet, and then pass wires through the slit.
* When taking in wires from the rear side, drill a knockout hole and exchange the bushing at side face.
For the hole remained opened by removing the bushing, adhere the attached thermal insulator (without slit) from
inside to close the hole.
• Tighten the screws of the terminal block, and fix the cables with cord clamp attached to the electric parts box.
(Do not apply tension to the connecting section of the terminal block.)
• Mount the cover of the electric parts box without pinching cables.
• Using the attached heat insulator for sealing of cable connecting port, seal the cable connecting port.
(Otherwise dewing may be caused.)
Wire inlet
Two screws
Electric parts box
Central wiring between indoor
For
and outdoor units and wiring
power supply
of remote controller
R(L) S(N) U U A B
1 2
Cord clamp
Treating of wiring connecting port
• As shown on the figure, seal the wire connecting port with heat insulator.
If sealing is insufficient, dewing is caused in the electric parts box.
Wire inlet
knockout hole (Rear side)
Terminal block
P.C. board
R S
(L) (N)
Earth line
Connecting cable
(R (L), S (N) terminal) Indoor unit power supply
(U , U terminal) Central wiring between
1 2
indoor and outdoor units
(A, B terminal) Remote controller wirng
Adhered surface
Slit
<Seal at wire inlet>
Remote controller wiring
• As the remote controller wire has no polarity,
there is no problem if connections to indoor
unit terminal blocks A and B are reversed.
Wiring between indoor and outdoor units
<Wiring example>
Outdoor Power supply Outdoor Power supply
380V-415V ~ 50Hz 380V-415V ~ 50Hz
380V ~ 60Hz 380V ~ 60Hz
Earth leakage
breaker
Header outdoor unit
Earth Earth
terminal L1 L2 L3 N U1 U2 U3 U4 U5 U6 terminal L1 L2 L3 N
Control wiring between outdoor units
Control wiring between indoor and outdoor units
Control wiring between indoor units
Indoor unit
Indoor unit
Earth Earth
L N U1 U2 A B L N
A B
Indoor power supply
220-240V, ~50Hz
Remote controller Remote controller
220V~60Hz
Earth leakage breaker
Pull box Pull box
power switch
Address setup
Set up the addresses according to the Installation Manual attached to the outdoor unit.
Wiring on the ceiling panel
According to the Installation Manual of the ceiling panel, connect the connector (5P: White) of the ceiling panel to the
connector (CN33: White) on P.C. board of the electric parts box.
<Wiring diagram>
Terminal block for
remote controller Terminal block
wiring of indoor unit
A
A Remote
B
B controller unit
Remote controller wire
(Field supply)
NOTE
An outdoor unit connected with
Central wiring between indoor
and outdoor units wire becomes
automatically the header unit.
Earth leakage
breaker
Header outdoor unit
U1 U2 U3 U4 U5 U6
Indoor unit
Indoor unit
Earth Earth
U1 U2 A B L N U1 U2 A B L N
A B A B
Remote controller
Pull box
U1 U2 A B